I think that the usability and price are good, but I wanted a big size that is not in this set, so I bought it separately. Besides the five sets, there were plenty of kinds of 7 to 8 sets, 10 sets etc ... Also thinking about the storage later, I wish I had it.

I used it for drilling a rubber plate, but I can not do it at all. I tried variously how to use it, but obediently there is no hole. At the end I pierced the hole with pliers. It is only possible to cut a quarter of the circumference.

I think that it is a product finished to a slightly larger cutting edge angle suitable for hard work. It seems to be a bit sharper for this application. It is a product with good cost performance, but it is 4 points.